We report the optical identifications of four new DA white dwarfs
coinciding with the position of faint sources jointly detected during
the EUVE\/ all-sky survey in the 58-174 Å\ (0.071-0.0214 keV) band
and the ROSAT\/ PSPC in the 0.1-0.28 keV X-ray band. We present low
resolution spectra of the possible optical counterparts found within
the error circle of these four EUVE/ROSAT\/ NOID fields, obtained with
1.5-m telescope at CTIO in December 1995 and February 1996. In the four
fields, we find DA stars for which we report
Balmer line profile analyses. Our preliminary analyses indicate these stars
have relatively high effective temperatures (in the 25,000 -- 50,000 K
range), consistent with being EUV sources. One of the white
dwarfs is potentially interesting since it appears to have a relatively
low effective temperature of 20,000 K and a surface gravity possibly
exceeding \log g of 9. The joint detection
in the EUVE\/ Lexan band and by ROSAT\/ XRT
indicates these stars have a low abundance of metals, and that
their EUV emission is mostly attenuated by the local ISM\@. Note that
out of the 42 EUVE/ROSAT\/ NOID fields observed so far, only 4
were found to have a DA as the most probable optical counterpart. We
will further discuss this low turnout of white dwarf detections among
the NOID fields in terms of the \log N - \log S distribution of
white dwarfs observed in the EUVE\/ all-sky survey.
This work is supported by NASA contract NAS5-29298.